#urea

Colligative Properties - Relative Lowering and Elevation of Boiling Point

What is the mass of urea (molar mass = 60 g/mol) required to prepare 2 kg of a 0.5 molal aqueous solution?

Molality = (Moles of solute/Mass of solvent in kg) . Moles = 0.5 × 2 = 1 mol . Mass = 1 × 60 = 60 g .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Colligative Properties - Relative Lowering and Elevation of Boiling Point

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Colligative Properties - Depression of Freezing Point

What is the freezing point depression of a solution containing 8 g of urea (molar mass = 60 g/mol) in 200 g of water? (

Moles of urea = (8/60) ≈ 0.1333 mol . Molality = (0.1333/0.2) ≈ 0.6665 mol/kg . Δ Tf = 1.86 × 0.6665 ≈ 1.24 K .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Colligative Properties - Depression of Freezing Point

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Laws of Chemical Combination - Conservation Mass Definite Multiple

A 300 mL solution contains 6 g of urea (NH₂CONH₂) and has a density of 1.02 g/mL. What is its molarity? (Molar mass: ure

Moles of urea = 6/60 = 0.1 mol. Volume = 0.3 L. Molarity = 0.1/0.3 ≈ 0.333 M.

Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Laws of Chemical Combination - Conservation Mass Definite Multiple

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Micturition Disorders and Accessory Excretory Organs

Which condition is characterized by an excess of urea in the blood?

Uremia is a condition in which urea accumulates in the blood due to kidney failure.

Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Micturition Disorders and Accessory Excretory Organs

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Micturition Disorders and Accessory Excretory Organs

Which of the following waste products is primarily eliminated through the skin?

Small amounts of urea are excreted through the skin via sweat.

Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Micturition Disorders and Accessory Excretory Organs

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Micturition Disorders and Accessory Excretory Organs

Which excretory product is primarily eliminated through sweat glands?

Small amounts of urea are excreted through sweat glands in the skin.

Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Micturition Disorders and Accessory Excretory Organs

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Concentration of Urine - Counter Current Mechanism

The process of removing nitrogenous waste in the form of urea is called:

Ureotelism is the process of excreting nitrogenous waste in the form of urea, seen in mammals and amphibians.

Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Concentration of Urine - Counter Current Mechanism

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Modes of Excretion - Ammonotelism Ureotelism Uricotelism

Which type of nitrogenous waste requires the most water for excretion?

Ammonia is highly toxic and requires large amounts of water for its elimination, which is why it is excreted by aquatic organisms.